APPENDIX D. 



Ixxi 



' \t it 



r.. 



Hall 



membrane, and that they can multiply by sub-division. The 



part 



Mohl 



conferv 



in the Micrographic Dictionary, though the latter 



^acter 



n-oid fii3 



and are 



Kieii 



I 



^ I 



failin. viJ^^'"^ 



'^.^ °f *e celk . 



masses, wlii 



oval 



' around each 

 "^^y ensue, Eifet 



eing ultimatel? life 



« I 



i1' 

 1^1 



iLammg and conlain 

 their green colon,! 

 ■e for the presence oh 

 mees advance tlie f 



X Al 



wa:^(?, possessiDjoi... 

 .^ the usual cta;e' 

 • such organisms' i 



with cilia, ^ 



> 





3tbeen 



lencin 



I'nc in 



tracei 



in the so*" 



.1 ^ 



ii«<* 



^ ^^ Je borf'^^^ 



^''''^ of* 



and Oris, and also by the author of the article on ' Chloro- 

 phyll' i 

 admits that they undergo segmentation \ With reference 



to these points, Dr. Hicks tells us that in some moss which 



he cultivated under glass, ' the various branches threw out 



numberless confervoid filaments, some of which approached 



the radicular rather than the confervoid type.' In both 



these kinds of filaments, however, he observed that their 



chlorophyll granules possessed the power of enlarging. The 



granules at first became more consistent on their exterior, at 

 the same time that they became larger. But Dr. Hicks 



says : — ' As they increased they showed a more distinct out- 



'dentation whilst sjl line, and it was clear that, whatever doubt might attach itself 



to the existence of a membrane on the exterior of the 

 chlorophyll utricles of the leaves and ordinary confervoid 

 filaments, these contents were enclosed by a delicate en- 



I V 



velope; and, as they further enlarged, a nucleus appeared 

 in the centre. After a time, the parent cell broke up. and 

 these once chlorophyll utricles, but how distinct cells, be- 

 came free. ... In the undisturbed condition in which they 

 existed, and being held together by the gum-like character 

 of the residue of the parent-cell wall, they, of course, did not 

 spread far; and, as the filaments had attached themselves to 

 the sides of the glass, I had an excellent opportunity of 

 watching their subsequent progress. . . . After increasing 

 gradually in an oval form, they arrived to about the yyo-^" in 

 size, when they began to segment into two, or three, or four 

 divisions, or even into more, a nucleus appearing in each 

 division. ... At this period the cell-wall of the parent- 

 cell (once chlorophyll utricle) was very marked. . . . After 



1 ( 



Linn. Trans.' vol. xxii. p. 580. 



